A Colossus makes short work of captured goblins in an arena. Notice the blood and corpses

A bronze colossus is a megabeast that can rapidly heal wounds inflicted by traps, destroy buildings from 1 space away (perhaps symbolizing its long reach), and toss the defenders of a fort around as if they were toyanvils. When one takes up residence near a fortress, it's up to those within to make an end of it, or it will make an end of them.

Strangely, this creature has eyes, but removing them won't do much as these metal monstrosities don't bleed or feel pain.

Upon its death a bronze colossus becomes a masterworkbronzestatue (worth 1500☼), great decoration for a grand entrance hall.

Bronze colossuses have very high rates of regeneration, but any part that gets broken severs. Due to these high rates of regeneration and lack of tiring, fighting a Bronze Colossus can be problematic as every time an assault on it fails you are basically starting over from scratch, only with fewer soldiers.